I always thought that in big battles with the amount of firepower in range of the front line destroyed units would be obliterated before C-fabs could turn their lathe on them (or else were overkilled so much it made no difference), meaning that the stats of the C-fab are irrelevant to how useful they are at repairing units. Am I wrong about this? I always used them as either minelayers or pelican dropped teleporter constructors.

With how inferno-heavy my compositions usually are if C-fabs can actually be used for healing I certainly want to try it out. Is it possible to give area-repair commands to your fabbers for units in battle?